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John, maybe you could put something between the bikes to keep them from coming in contact with each other. Don't laugh, but bubble wrap might work for you. It's light weight and you could stuff some between contact points and keep it in place with tape or string.
As John has found out, 72" is a long span, even for 2" square tubing. The problem is 'enhanced' by having to use a 10 or 12 inch extension to clear the back of the trailer. The extension acts like a lever on the hitch, and the more weight added to the extension (such as an additional bike) only makes matters worse. It would be pretty easy to beef up the Reese to make it stronger, but would require being able to cut and weld steel.
We have a front mount hitch on our tow vehicle. It was cheap ($120 or so), and a lot stronger with a suspended weight rating of 300 pounds. We don't use it for bikes, but it would definitely work.
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